From the support forum:
"There was an unexpected change to the server on Monday but I have updated in the members area to get around this change.
If you are using the installed version you will need to go to the members area download page to download and install the latest installer, this will not remove any profile information or settings and there is no need to uninstall first.
If you are using the portable version you should be able to update using the portable loader or by downloading the "Portable Update" from the members area page.
Members area"